双层钢桁架悬索桥整体节点疲劳试验研究

发布时间：2018-06-17 16:13

本文选题：双层钢桁架 + 悬索桥　；参考：《中外公路》2017年02期

【摘要】：大连星海湾大桥是中国首座双层钢桁架公路悬索桥,其主桁架杆件采用整体节点连接。为了掌握该桥整体节点的疲劳性能,对弦杆整体节点1∶2缩尺模型进行疲劳试验。参考国内外同类桥梁疲劳试验,采用英国规范BS 5400规定的标准疲劳车,确定疲劳试验荷载取值。在设定的试验荷载下进行200万次循环加载。在试验过程中每50万次循环加载后停机进行静载试验,并对模型重点部位进行裂纹观察。结合国内外相关规范,评估整体节点的疲劳安全性能。试验结果表明:实测应力幅基本为50 MPa以下,试验模型应力水平较低,疲劳加载200万次后,试验模型未出现裂纹。在结构使用寿命期间内和正常养护维修情况下,整体节点不会发生疲劳破坏。
[Abstract]:Dalian Xingwan Bridge is the first double-deck steel truss highway suspension bridge in China. In order to master the fatigue performance of the whole joint of the bridge, the fatigue test was carried out on the 1:2 scale model of the chord integral joint. Referring to the fatigue tests of similar bridges at home and abroad, the standard fatigue vehicle specified in British Code BS 5400 is adopted to determine the fatigue test load. 2 million cyclic loads were carried out under the set test load. In the course of the test, the static load test was carried out after every 500000 cyclic loading, and the crack observation was carried out on the key parts of the model. The fatigue safety performance of the whole joint is evaluated according to the relevant codes at home and abroad. The experimental results show that the measured stress amplitude is less than 50 MPA, and the stress level of the test model is low. After 2 million times of fatigue loading, there is no crack in the test model. During the service life of the structure and the normal maintenance condition, the fatigue failure of the whole joint will not occur.
【作者单位】：大连理工大学桥梁工程研究所;华南理工大学亚热带建筑科学国家重点实验室;大连大学材料破坏力学数值试验研究中心;
【基金】：国家留学基金资助项目(编号:201506060044,201508210247) 辽宁省教育厅科学研究项目(编号:L2014027) 中央高校基本科研业务费专项资金资助项目(编号:DUT15QY34) 亚热带建筑科学国家重点实验室开放基金项目(编号:2014KB11)
【分类号】：U448.25

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